As a Colemak (DH) user for ~5 years, I share these experiences.

I did a monkeytype benchmark before switching, and I still barely hit the same numbers, so it's certainly not a magic fix for more typing speed. What is left then is the argument concerning ergonomics: which I am not sure is worth the trade-offs.

Every time I now sit at another's computer I am unable to type without glancing at the keyboard. Moreover, I am trying to switch to (n)vim, and am completely at a loss navigating, as the hjkl keys are now scattered across the keyboard -- beating their purpose.